🧬 A New Molecular Map Reveals How Influenza Takes Over Human Cells
Article summary:
A research team from EMBL Hamburg, in collaboration with the Leibniz Institute for Molecular Pharmacology, has succeeded in drawing an accurate molecular map that shows how Influenza A virus proteins interact with human cell proteins inside intact cells, without the need to break them apart. This discovery provides a new model for understanding the mechanisms by which the virus exploits human cells, and sheds light on its strategies for controlling the infected cell, including the breakdown of nuclear structures known as paraspeckles, which may help develop more effective vaccines and antiviral therapies.
🧪 Influenza A.. A global health challenge
Influenza A virus causes millions of acute cases every year, with between 3 and 5 million cases severe worldwide, and more than 650,000 deaths associated with it. Historically, this virus has caused several major epidemics, including the 1918 Spanish flu pandemic.
When the virus enters a human cell, it releases its RNA genomes, which carry instructions for producing a limited set of viral proteins used to redirect the cell’s functions. These proteins reprogram the cell’s machinery, turning it into a factory that produces new viral particles.
🧠 How did scientists map this in detail inside intact cells?
Studying “protein-protein” interactions inside infected cells is a major challenge, because the traditional reliance on cell lysis exposes proteins to abnormal interference.
To address this problem, the team used a modified Cross-linking Mass Spectrometry (XL-MS) technique, which allowed virologists to measure protein interactions directly inside whole cells without breaking them apart. This made it possible to obtain more accurate data on the locations and duration of these interactions during infection.
This technique is excellent at capturing:
- Transient interactions that may disappear in traditional experiments.
- Interactions that occur within specific locations in the cell.
- Structural data that explain the shape and point of contact of proteins inside cells.
🌱 The integration of experiments and artificial intelligence
After obtaining protein-interaction data using XL-MS, the researchers used the modified version of AlphaFold, one of the best-known tools for predicting atomic protein structure. Integrating this program with the experimental data allowed the model to simulate the shape of complex assemblies between viral proteins and human proteins, which is an extremely difficult task.
This integration strengthens our understanding of how assembly and secondary structure help the virus penetrate cells and alter their functions, opening new horizons for understanding the precise interactions that could be targeted for future intervention.
🩺 Two main strategies used by Influenza A virus to control the cell
1. Controlling the hemagglutinin (Hemagglutinin) protein
Hemagglutinin is a prominent part of the virus surface, helping it adhere to human cells and begin the infection process. The new map showed how this protein passes through transport and processing networks inside the cell, where certain human proteins help modify and fold hemagglutinin properly to make it functional.
This shows that the virus does not merely invade the cell; it also uses its internal proteins to improve the formation of its components, something that had not been fully understood before.
2. Breaking down paraspeckles in the cell nucleus
paraspeckles are small structures inside the nucleus that contain proteins associated with RNA-binding proteins. The study revealed that the influenza virus causes these structures to break down, leading to the release of the proteins trapped within them.
The virus can use these released proteins to support its replication process.
In addition, paraspeckles contribute to the cell’s stress response and to regulating antiviral gene expression, so their destruction may weaken the body’s defenses against infection.
🧬 A global, collaborative, multidisciplinary project
This research was completed through collaboration between several institutes: XL-MS techniques at Charité in Berlin, glycosylated protein analysis at the EMBL Proteomics Facility, and structural modeling at the EMBL Computing Cluster, with visual support through microscopy at CSSB.
This collaboration brought together multiple skills and advanced technologies not only to generate precise data, but also to provide deep insights capable of shaping future research and therapeutic targets.
🧪 New horizons for understanding viruses with pandemic potential
This research reveals possibilities that go beyond Influenza A, as the same methodology can be applied to other potentially pandemic viruses such as H5N1. The goal is to build accurate models that break down the ways viruses exploit components of the human cell through specific temporal and spatial pathways.
Through this, it will be possible to define new, more precise and effective drug intervention targets, helping improve the response to future pandemics.
Conclusion
The new molecular map of Influenza A virus interactions with proteins of intact cells reveals the complexity of its strategies for penetration and cellular exploitation. The virus uses its multifunctional proteins to control vital cellular processes, including preparing its surface components and breaking down critical nuclear structures.
This study presents a new methodological model based on modified XL-MS technology, supported by AlphaFold modeling, enabling an unprecedented level of precision in understanding viruses within the context of their native cells.
This insight may play a pivotal role in the future of vaccine and antiviral research, and it also provides a platform for dealing with emerging future pandemic threats caused by other viruses.
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